---
id: CVE-2026-16910
title: 'Quay: ssrf in red hat quay notification webhooks (slack/generic)'
summary: >-
  A flaw was found in Red Hat Quay's notification webhook feature. The Slack and
  generic webhook notification handlers accept user-supplied URLs without SSRF
  validation, allowing a repository administrator to make the Quay worker issue
  POS…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-918
vendor: Red Hat
product: openshift-update-service/openshift-update-service-rhel8
affected:
  - openshift-update-service/openshift-update-service-rhel8 (all versions)
  - quay/quay-rhel8
  - quay/quay-rhel9 (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-24T10:55:31.656441Z'
published: '2026-07-24'
updated: '2026-11-01'
sourceUpdated: '2026-11-01T05:06:49.126Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-16910'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-16910'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2506685'
    label: RHBZ#2506685
tags:
  - cve.org
epss: 0.00288
epssPercentile: 0.21447
ingestedAt: '2026-11-05T18:28:50.695Z'
---

## Overview

A flaw was found in Red Hat Quay's notification webhook feature. The Slack and generic webhook notification handlers accept user-supplied URLs without SSRF validation, allowing a repository administrator to make the Quay worker issue POST requests to internal network addresses or cloud infrastructure endpoints that should not be reachable from the application.

## Affected

- `openshift-update-service/openshift-update-service-rhel8 (all versions)`
- `quay/quay-rhel8`
- `quay/quay-rhel9 (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

Restrict network egress from Quay worker pods/containers using network policies or firewall rules to block outbound connections to internal network ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) and cloud metadata endpoints (169.254.169.254). Limit repository creation and admin privileges to trusted users. Configure WEBHOOK_HOSTNAME_BLACKLIST in Quay config to include known internal hostnames and IP ranges.